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apple2ix/src/video/glvideo.c

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/*
* Apple // emulator for *nix
*
* This software package is subject to the GNU General Public License
* version 2 or later (your choice) as published by the Free Software
* Foundation.
*
* THERE ARE NO WARRANTIES WHATSOEVER.
*
*/
// glvideo -- Created by Aaron Culliney
#include "common.h"
#include "video/glvideo.h"
#include "video/glinput.h"
#include "video/glnode.h"
bool safe_to_do_opengl_logging = false;
volatile bool _vid_dirty = true;
static int windowWidth = SCANWIDTH*1.5;
static int windowHeight = SCANHEIGHT*1.5;
static int viewportX = 0;
static int viewportY = 0;
static int viewportWidth = SCANWIDTH*1.5;
static int viewportHeight = SCANHEIGHT*1.5;
#if MOBILE_DEVICE
static int adjustedHeight = 0;
#endif
GLint uniformTex2Use = UNINITIALIZED_GL;
GLint alphaValue = UNINITIALIZED_GL;
static GLint uniformMVPIdx = UNINITIALIZED_GL;
static GLenum crtElementType = UNINITIALIZED_GL;
static GLuint crtNumElements = UNINITIALIZED_GL;
static GLuint a2TextureName = UNINITIALIZED_GL;
static GLuint defaultFBO = UNINITIALIZED_GL;
static GLuint program = UNINITIALIZED_GL;
static GLuint crtVAOName = UNINITIALIZED_GL;
static GLuint posBufferName = UNINITIALIZED_GL;
static GLuint texcoordBufferName = UNINITIALIZED_GL;
static GLuint elementBufferName = UNINITIALIZED_GL;
static GLModel *crtModel = NULL;
static video_backend_s glvideo_backend = { 0 };
#if USE_GLUT
static int glutWindow = -1;
#endif
//----------------------------------------------------------------------------
//
// OpenGL helper routines
//
static void _create_CRT_model(void) {
// NOTE: vertices in Normalized Device Coordinates
const GLfloat crt_positions[] = {
// CRT screen quad
-1.0, -1.0, 0.0, 1.0,
1.0, -1.0, 0.0, 1.0,
-1.0, 1.0, 0.0, 1.0,
1.0, 1.0, 0.0, 1.0,
#if PERSPECTIVE
// CRT back side point
0.0, 0.0, -1.0, 1.0,
#endif
};
const GLfloat crt_texcoords[] = {
0.0, 1.0,
1.0, 1.0,
0.0, 0.0,
1.0, 0.0,
};
const GLushort indices[] = {
// CRT screen quad
0, 1, 2, 2, 1, 3
#if PERSPECTIVE
// ...
#endif
};
GLModel *crt = calloc(1, sizeof(GLModel));
crt->numVertices = 4;
crt->numElements = 6;
crt->positions = malloc(sizeof(crt_positions));
memcpy(crt->positions, &crt_positions[0], sizeof(crt_positions));
crt->positionType = GL_FLOAT;
crt->positionSize = 4; // x,y,z coordinates
crt->positionArraySize = sizeof(crt_positions);
crt->texCoords = malloc(sizeof(crt_texcoords));
memcpy(crt->texCoords, &crt_texcoords[0], sizeof(crt_texcoords));
crt->texcoordType = GL_FLOAT;
crt->texcoordSize = 2; // s,t coordinates
crt->texcoordArraySize = sizeof(crt_texcoords);
crt->normals = NULL;
crt->normalType = GL_NONE;
crt->normalSize = GL_NONE;
crt->normalArraySize = 0;
crt->elements = malloc(sizeof(indices));
memcpy(crt->elements, &indices[0], sizeof(indices));
crt->elementType = GL_UNSIGNED_SHORT;
crt->elementArraySize = sizeof(indices);
mdlDestroyModel(&crtModel);
crtModel = crt;
}
static void _create_VAO_VBOs(void) {
// Create a vertex array object (VAO) to cache model parameters
#if USE_VAO
glGenVertexArrays(1, &crtVAOName);
glBindVertexArray(crtVAOName);
#endif
// Create a vertex buffer object (VBO) to store positions and load data
glGenBuffers(1, &posBufferName);
glBindBuffer(GL_ARRAY_BUFFER, posBufferName);
glBufferData(GL_ARRAY_BUFFER, crtModel->positionArraySize, crtModel->positions, GL_STATIC_DRAW);
#if USE_VAO
// Enable the position attribute for this VAO
glEnableVertexAttribArray(POS_ATTRIB_IDX);
// Get the size of the position type so we can set the stride properly
GLsizei posTypeSize = getGLTypeSize(crtModel->positionType);
// Set up parmeters for position attribute in the VAO including,
// size, type, stride, and offset in the currenly bound VAO
// This also attaches the position VBO to the VAO
glVertexAttribPointer(POS_ATTRIB_IDX, // What attibute index will this array feed in the vertex shader (see buildProgram)
crtModel->positionSize, // How many elements are there per position?
crtModel->positionType, // What is the type of this data?
GL_FALSE, // Do we want to normalize this data (0-1 range for fixed-pont types)
crtModel->positionSize*posTypeSize, // What is the stride (i.e. bytes between positions)?
0); // What is the offset in the VBO to the position data?
#endif
if (crtModel->texCoords) {
// Create a VBO to store texcoords
glGenBuffers(1, &texcoordBufferName);
glBindBuffer(GL_ARRAY_BUFFER, texcoordBufferName);
// Allocate and load texcoord data into the VBO
glBufferData(GL_ARRAY_BUFFER, crtModel->texcoordArraySize, crtModel->texCoords, GL_STATIC_DRAW);
#if USE_VAO
// Enable the texcoord attribute for this VAO
glEnableVertexAttribArray(TEXCOORD_ATTRIB_IDX);
// Get the size of the texcoord type so we can set the stride properly
GLsizei texcoordTypeSize = getGLTypeSize(crtModel->texcoordType);
// Set up parmeters for texcoord attribute in the VAO including,
// size, type, stride, and offset in the currenly bound VAO
// This also attaches the texcoord VBO to VAO
glVertexAttribPointer(TEXCOORD_ATTRIB_IDX, // What attibute index will this array feed in the vertex shader (see buildProgram)
crtModel->texcoordSize, // How many elements are there per texture coord?
crtModel->texcoordType, // What is the type of this data in the array?
GL_TRUE, // Do we want to normalize this data (0-1 range for fixed-point types)
crtModel->texcoordSize*texcoordTypeSize, // What is the stride (i.e. bytes between texcoords)?
0); // What is the offset in the VBO to the texcoord data?
#endif
}
// Create a VBO to vertex array elements
// This also attaches the element array buffer to the VAO
glGenBuffers(1, &elementBufferName);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, elementBufferName);
// Allocate and load vertex array element data into VBO
glBufferData(GL_ELEMENT_ARRAY_BUFFER, crtModel->elementArraySize, crtModel->elements, GL_STATIC_DRAW);
GL_ERRLOG("finished creating VAO/VBOs");
}
static void _destroy_VAO(GLuint vaoName) {
// Bind the VAO so we can get data from it
#if USE_VAO
glBindVertexArray(vaoName);
// For every possible attribute set in the VAO
for (GLuint index = 0; index < 16; index++) {
// Get the VBO set for that attibute
GLuint bufName = 0;
glGetVertexAttribiv(index , GL_VERTEX_ATTRIB_ARRAY_BUFFER_BINDING, (GLint*)&bufName);
// If there was a VBO set...
if (bufName) {
//...delete the VBO
glDeleteBuffers(1, &bufName);
}
}
// Get any element array VBO set in the VAO
{
GLuint bufName = 0;
glGetIntegerv(GL_ELEMENT_ARRAY_BUFFER_BINDING, (GLint*)&bufName);
// If there was a element array VBO set in the VAO
if (bufName) {
//...delete the VBO
glDeleteBuffers(1, &bufName);
}
}
// Finally, delete the VAO
glDeleteVertexArrays(1, &vaoName);
#else
glDeleteBuffers(1, &posBufferName);
posBufferName = UNINITIALIZED_GL;
glDeleteBuffers(1, &texcoordBufferName);
texcoordBufferName = UNINITIALIZED_GL;
glDeleteBuffers(1, &elementBufferName);
elementBufferName = UNINITIALIZED_GL;
#endif
GL_ERRLOG("destroying VAO/VBOs");
}
static GLuint _create_CRT_texture(void) {
GLuint texName;
// Create a texture object to apply to model
glGenTextures(1, &texName);
glActiveTexture(TEXTURE_ACTIVE_FRAMEBUFFER);
glBindTexture(GL_TEXTURE_2D, texName);
// Set up filter and wrap modes for this texture object
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
// Indicate that pixel rows are tightly packed (defaults to a stride of sizeof(PIXEL_TYPE) which is good for RGBA or
// FLOAT data types)
glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
// Allocate and load image data into texture
glTexImage2D(GL_TEXTURE_2D, /*level*/0, TEX_FORMAT_INTERNAL, SCANWIDTH, SCANHEIGHT, /*border*/0, TEX_FORMAT, TEX_TYPE, NULL);
GL_ERRLOG("finished creating CRT texture");
return texName;
}
static GLuint _build_program(demoSource *vertexSource, demoSource *fragmentSource, bool hasNormal, bool hasTexcoord) {
GLuint prgName;
GLint logLength, status;
// String to pass to glShaderSource
GLchar *sourceString = NULL;
// Determine if GLSL version 140 is supported by this context.
// We'll use this info to generate a GLSL shader source string
// with the proper version preprocessor string prepended
float glLanguageVersion = 0.f;
char *shaderLangVersion = (char *)glGetString(GL_SHADING_LANGUAGE_VERSION);
if (shaderLangVersion == NULL) {
ERRQUIT("shader toolchain unavailable");
}
#if TARGET_OS_IPHONE
sscanf(shaderLangVersion, "OpenGL ES GLSL ES %f", &glLanguageVersion);
#else
sscanf(shaderLangVersion, "%f", &glLanguageVersion);
#endif
// GL_SHADING_LANGUAGE_VERSION returns the version standard version form
// with decimals, but the GLSL version preprocessor directive simply
// uses integers (thus 1.10 should 110 and 1.40 should be 140, etc.)
// We multiply the floating point number by 100 to get a proper
// number for the GLSL preprocessor directive
GLuint version = 100 * glLanguageVersion;
// Get the size of the version preprocessor string info so we know
// how much memory to allocate for our sourceString
const GLsizei versionStringSize = sizeof("#version 123\n");
// Create a program object
prgName = glCreateProgram();
// Indicate the attribute indicies on which vertex arrays will be
// set with glVertexAttribPointer
// See buildVAO to see where vertex arrays are actually set
glBindAttribLocation(prgName, POS_ATTRIB_IDX, "inPosition");
if (hasNormal) {
glBindAttribLocation(prgName, NORMAL_ATTRIB_IDX, "inNormal");
}
if (hasTexcoord) {
glBindAttribLocation(prgName, TEXCOORD_ATTRIB_IDX, "inTexcoord");
}
//////////////////////////////////////
// Specify and compile VertexShader //
//////////////////////////////////////
// Allocate memory for the source string including the version preprocessor information
sourceString = malloc(vertexSource->byteSize + versionStringSize);
// Prepend our vertex shader source string with the supported GLSL version so
// the shader will work on ES, Legacy, and OpenGL 3.2 Core Profile contexts
if (version) {
sprintf(sourceString, "#version %d\n%s", version, vertexSource->string);
} else {
RELEASE_LOG("YAY, you have an awesome OpenGL vendor for this device ... no GLSL version specified ... so NOT adding a #version directive to shader sources =P");
sprintf(sourceString, "%s", vertexSource->string);
}
GLuint vertexShader = glCreateShader(GL_VERTEX_SHADER);
glShaderSource(vertexShader, 1, (const GLchar **)&(sourceString), NULL);
glCompileShader(vertexShader);
glGetShaderiv(vertexShader, GL_INFO_LOG_LENGTH, &logLength);
if (logLength > 0) {
GLchar *log = (GLchar *)malloc(logLength);
glGetShaderInfoLog(vertexShader, logLength, &logLength, log);
LOG("Vtx Shader compile log:%s\n", log);
free(log);
}
glGetShaderiv(vertexShader, GL_COMPILE_STATUS, &status);
if (status == 0) {
LOG("Failed to compile vtx shader:\n%s\n", sourceString);
return 0;
}
free(sourceString);
sourceString = NULL;
// Attach the vertex shader to our program
glAttachShader(prgName, vertexShader);
// Delete the vertex shader since it is now attached
// to the program, which will retain a reference to it
glDeleteShader(vertexShader);
/////////////////////////////////////////
// Specify and compile Fragment Shader //
/////////////////////////////////////////
// Allocate memory for the source string including the version preprocessor information
sourceString = malloc(fragmentSource->byteSize + versionStringSize);
// Prepend our fragment shader source string with the supported GLSL version so
// the shader will work on ES, Legacy, and OpenGL 3.2 Core Profile contexts
if (version) {
sprintf(sourceString, "#version %d\n%s", version, fragmentSource->string);
} else {
sprintf(sourceString, "%s", fragmentSource->string);
}
GLuint fragShader = glCreateShader(GL_FRAGMENT_SHADER);
glShaderSource(fragShader, 1, (const GLchar **)&(sourceString), NULL);
glCompileShader(fragShader);
glGetShaderiv(fragShader, GL_INFO_LOG_LENGTH, &logLength);
if (logLength > 0) {
GLchar *log = (GLchar *)malloc(logLength);
glGetShaderInfoLog(fragShader, logLength, &logLength, log);
LOG("Frag Shader compile log:\n%s\n", log);
free(log);
}
glGetShaderiv(fragShader, GL_COMPILE_STATUS, &status);
if (status == 0) {
LOG("Failed to compile frag shader:\n%s\n", sourceString);
return 0;
}
free(sourceString);
sourceString = NULL;
// Attach the fragment shader to our program
glAttachShader(prgName, fragShader);
// Delete the fragment shader since it is now attached
// to the program, which will retain a reference to it
glDeleteShader(fragShader);
//////////////////////
// Link the program //
//////////////////////
glLinkProgram(prgName);
glGetProgramiv(prgName, GL_INFO_LOG_LENGTH, &logLength);
if (logLength > 0) {
GLchar *log = (GLchar*)malloc(logLength);
glGetProgramInfoLog(prgName, logLength, &logLength, log);
LOG("Program link log:\n%s\n", log);
free(log);
}
glGetProgramiv(prgName, GL_LINK_STATUS, &status);
if (status == 0) {
LOG("Failed to link program");
return 0;
}
glValidateProgram(prgName);
glGetProgramiv(prgName, GL_INFO_LOG_LENGTH, &logLength);
if (logLength > 0) {
GLchar *log = (GLchar*)malloc(logLength);
glGetProgramInfoLog(prgName, logLength, &logLength, log);
LOG("Program validate log:\n%s\n", log);
free(log);
}
glGetProgramiv(prgName, GL_VALIDATE_STATUS, &status);
if (status == 0) {
LOG("Failed to validate program");
return 0;
}
glUseProgram(prgName);
///////////////////////////////////////
// Setup common program input points //
///////////////////////////////////////
GLint fbSamplerLoc = glGetUniformLocation(prgName, "framebufferTexture");
if (fbSamplerLoc < 0) {
LOG("OOPS, no framebufferTexture shader : %d", fbSamplerLoc);
} else {
glUniform1i(fbSamplerLoc, TEXTURE_ID_FRAMEBUFFER);
}
GLint messageSamplerLoc = glGetUniformLocation(prgName, "messageTexture");
if (messageSamplerLoc < 0) {
LOG("OOPS, no messageSamplerLoc shader : %d", messageSamplerLoc);
} else {
glUniform1i(messageSamplerLoc, TEXTURE_ID_MESSAGE);
}
GLint maxTextureUnits = -1;
glGetIntegerv(GL_MAX_TEXTURE_IMAGE_UNITS, &maxTextureUnits);
if (maxTextureUnits < TEXTURE_ID_MAX) {
#warning FIXME TODO ... gracefully handle devices with low max texture units?
ERRLOG("OOPS ... MAX TEXTURE UNITS : %d (<%d)", maxTextureUnits, TEXTURE_ID_MAX);
} else {
LOG("GL_MAX_TEXTURE_IMAGE_UNITS : %d", maxTextureUnits);
}
#if INTERFACE_TOUCH
GLint axisSamplerLoc = glGetUniformLocation(prgName, "axisTexture");
if (axisSamplerLoc < 0) {
LOG("OOPS, no axisSamplerLoc shader : %d", axisSamplerLoc);
} else {
glUniform1i(axisSamplerLoc, TEXTURE_ID_TOUCHJOY_AXIS);
}
GLint buttonSamplerLoc = glGetUniformLocation(prgName, "buttonTexture");
if (buttonSamplerLoc < 0) {
LOG("OOPS, no buttonSamplerLoc shader : %d", buttonSamplerLoc);
} else {
glUniform1i(buttonSamplerLoc, TEXTURE_ID_TOUCHJOY_BUTTON);
}
GLint kbdSamplerLoc = glGetUniformLocation(prgName, "kbdTexture");
if (kbdSamplerLoc < 0) {
LOG("OOPS, no kbdSamplerLoc shader : %d", kbdSamplerLoc);
} else {
glUniform1i(kbdSamplerLoc, TEXTURE_ID_TOUCHKBD);
}
GLint menuLeftSamplerLoc = glGetUniformLocation(prgName, "menuLeftTexture");
if (menuLeftSamplerLoc < 0) {
LOG("OOPS, no menuLeftSamplerLoc shader : %d", menuLeftSamplerLoc);
} else {
glUniform1i(menuLeftSamplerLoc, TEXTURE_ID_TOUCHMENU_LEFT);
}
GLint menuRightSamplerLoc = glGetUniformLocation(prgName, "menuRightTexture");
if (menuRightSamplerLoc < 0) {
LOG("OOPS, no menuRightSamplerLoc shader : %d", menuRightSamplerLoc);
} else {
glUniform1i(menuRightSamplerLoc, TEXTURE_ID_TOUCHMENU_RIGHT);
}
#endif
uniformMVPIdx = glGetUniformLocation(prgName, "modelViewProjectionMatrix");
if (uniformMVPIdx < 0) {
LOG("OOPS, no modelViewProjectionMatrix in shader : %d", uniformMVPIdx);
}
uniformTex2Use = glGetUniformLocation(prgName, "tex2Use");
if (uniformTex2Use < 0) {
LOG("OOPS, no texture selector in shader : %d", uniformTex2Use);
}
alphaValue = glGetUniformLocation(prgName, "aValue");
if (alphaValue < 0) {
LOG("OOPS, no texture selector in shader : %d", alphaValue);
}
GL_ERRLOG("build program");
return prgName;
}
static demoSource *_create_shader_source(const char *fileName) {
demoSource *src = NULL;
#if defined(__APPLE__)
CFBundleRef mainBundle = CFBundleGetMainBundle();
CFStringRef fileString = CFStringCreateWithCString(/*allocator*/NULL, fileName, CFStringGetSystemEncoding());
CFURLRef fileURL = CFBundleCopyResourceURL(mainBundle, fileString, NULL, NULL);
CFRELEASE(fileString);
CFStringRef filePath = CFURLCopyFileSystemPath(fileURL, kCFURLPOSIXPathStyle);
CFRELEASE(fileURL);
src = srcLoadSource(CFStringGetCStringPtr(filePath, CFStringGetSystemEncoding()));
CFRELEASE(filePath);
#else
char *filePath = NULL;
asprintf(&filePath, "%s/shaders/%s", data_dir, fileName);
if (filePath) {
src = srcLoadSource(filePath);
free(filePath);
} else {
ERRLOG("OOPS Could not load shader from %s (%s)", filePath, fileName);
}
#endif
return src;
}
static void gldriver_render(void);
static void gldriver_init_common(void) {
LOG("%s %s", glGetString(GL_RENDERER), glGetString(GL_VERSION));
if (!viewportWidth) {
viewportWidth = 400;
}
if (!viewportHeight) {
viewportHeight = 400;
}
// ----------------------------
// Create CRT model VAO/VBOs
// create CRT model
_create_CRT_model();
// Build Vertex Buffer Objects (VBOs) and Vertex Array Object (VAOs) with our model data
_create_VAO_VBOs();
// Cache the number of element and primType to use later in our glDrawElements calls
crtNumElements = crtModel->numElements;
crtElementType = crtModel->elementType;
#if USE_VAO
// We're using VAOs we can destroy certain buffers since they are already
// loaded into GL and we've saved anything else we need
FREE(crtModel->elements);
FREE(crtModel->positions);
FREE(crtModel->normals);
FREE(crtModel->texCoords);
#endif
// Build a default texture object with our image data
a2TextureName = _create_CRT_texture();
// ----------------------------
// Load/setup shaders
demoSource *vtxSource = _create_shader_source("Basic.vsh");
demoSource *frgSource = _create_shader_source("Basic.fsh");
// Build/use Program
program = _build_program(vtxSource, frgSource, /*withNormal:*/false, /*withTexcoord:*/true);
srcDestroySource(vtxSource);
srcDestroySource(frgSource);
// ----------------------------
// setup static OpenGL state
// Depth test will always be enabled
glEnable(GL_DEPTH_TEST);
// We will always cull back faces for better performance
glEnable(GL_CULL_FACE);
// Always use this clear color
glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
// Draw our scene once without presenting the rendered image.
// This is done in order to pre-warm OpenGL
// We don't need to present the buffer since we don't actually want the
// user to see this, we're only drawing as a pre-warm stage
gldriver_render();
// Check for errors to make sure all of our setup went ok
GL_ERRLOG("finished initialization");
#if !defined(__APPLE__)
//glBindFramebuffer(GL_FRAMEBUFFER, defaultFBO);
#endif
GLenum status = glCheckFramebufferStatus(GL_FRAMEBUFFER);
if (status != GL_FRAMEBUFFER_COMPLETE) {
ERRQUIT("framebuffer status: %04X", status);
}
}
static void _gldriver_shutdown(void) {
// Cleanup all OpenGL objects
emulator_shutting_down = true;
glDeleteTextures(1, &a2TextureName);
a2TextureName = UNINITIALIZED_GL;
_destroy_VAO(crtVAOName);
crtVAOName = UNINITIALIZED_GL;
mdlDestroyModel(&crtModel);
glDeleteProgram(program);
program = UNINITIALIZED_GL;
glnode_shutdownNodes();
LOG("Completed GLDriver shutdown ...");
}
static void gldriver_shutdown(void) {
#if USE_GLUT
glutLeaveMainLoop();
#else
_gldriver_shutdown();
#endif
}
//----------------------------------------------------------------------------
//
// update, render, reshape
//
#if USE_GLUT
static void gldriver_update(int unused) {
#if DEBUG_GL
static uint32_t prevCount = 0;
static uint32_t idleCount = 0;
idleCount++;
static struct timespec prev = { 0 };
struct timespec now;
clock_gettime(CLOCK_MONOTONIC, &now);
if (now.tv_sec != prev.tv_sec) {
LOG("gldriver_update() : %u", idleCount-prevCount);
prevCount = idleCount;
prev = now;
}
#endif
c_keys_handle_input(-1, 0, 0);
glutPostRedisplay();
glutTimerFunc(17, gldriver_update, 0);
}
#endif
static void gldriver_render(void) {
const uint8_t * const fb = video_current_framebuffer();
if (UNLIKELY(!fb)) {
return;
}
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
#if MOBILE_DEVICE
glViewport(viewportX, adjustedHeight, viewportWidth, viewportHeight);
#endif
#if PERSPECTIVE
// Calculate modelview and projection matrices
GLfloat modelView[16];
GLfloat projection[16];
mtxLoadPerspective(projection, 90, (float)viewportWidth / (float)viewportHeight, 5.0, 10000);
#endif
// Calculate the modelview matrix to render our character
// at the proper position and rotation
GLfloat mvp[16];
#if PERSPECTIVE
// Create model-view-projection matrix
//mtxLoadTranslate(modelView, 0, 150, -450);
//mtxRotateXApply(modelView, -90.0f);
//mtxRotateApply(modelView, -45.0f, 0.7, 0.3, 1);
mtxMultiply(mvp, projection, modelView);
#else
// Just load an identity matrix for a pure orthographic/non-perspective viewing
mtxLoadIdentity(mvp);
#endif
// Have our shader use the modelview projection matrix
// that we calculated above
glUniformMatrix4fv(uniformMVPIdx, 1, GL_FALSE, mvp);
char pixels[SCANWIDTH * SCANHEIGHT * sizeof(PIXEL_TYPE)];
if (_vid_dirty) {
// Update texture from indexed-color Apple //e internal framebuffer
unsigned int count = SCANWIDTH * SCANHEIGHT;
for (unsigned int i=0, j=0; i<count; i++, j+=sizeof(PIXEL_TYPE)) {
uint8_t index = *(fb + i);
*( (PIXEL_TYPE*)(pixels + j) ) = (PIXEL_TYPE)(
((PIXEL_TYPE)(colormap[index].red) << SHIFT_R) |
((PIXEL_TYPE)(colormap[index].green) << SHIFT_G) |
((PIXEL_TYPE)(colormap[index].blue) << SHIFT_B) |
((PIXEL_TYPE)MAX_SATURATION << SHIFT_A)
);
}
}
glActiveTexture(TEXTURE_ACTIVE_FRAMEBUFFER);
glBindTexture(GL_TEXTURE_2D, a2TextureName);
glUniform1i(uniformTex2Use, TEXTURE_ID_FRAMEBUFFER);
if (_vid_dirty) {
glTexImage2D(GL_TEXTURE_2D, /*level*/0, TEX_FORMAT_INTERNAL, SCANWIDTH, SCANHEIGHT, /*border*/0, TEX_FORMAT, TEX_TYPE, (GLvoid *)&pixels[0]);
}
// Bind our vertex array object
#if USE_VAO
glBindVertexArray(crtVAOName);
#else
glBindBuffer(GL_ARRAY_BUFFER, posBufferName);
GLsizei posTypeSize = getGLTypeSize(crtModel->positionType);
GLsizei texcoordTypeSize = getGLTypeSize(crtModel->texcoordType);
// Set up parmeters for position attribute in the VAO including, size, type, stride, and offset in the currenly
// bound VAO This also attaches the position VBO to the VAO
glVertexAttribPointer(POS_ATTRIB_IDX, // What attibute index will this array feed in the vertex shader (see buildProgram)
crtModel->positionSize, // How many elements are there per position?
crtModel->positionType, // What is the type of this data?
GL_FALSE, // Do we want to normalize this data (0-1 range for fixed-pont types)
crtModel->positionSize*posTypeSize, // What is the stride (i.e. bytes between positions)?
0); // What is the offset in the VBO to the position data?
glEnableVertexAttribArray(POS_ATTRIB_IDX);
// Set up parmeters for texcoord attribute in the VAO including, size, type, stride, and offset in the currenly
// bound VAO This also attaches the texcoord VBO to VAO
glBindBuffer(GL_ARRAY_BUFFER, texcoordBufferName);
glVertexAttribPointer(TEXCOORD_ATTRIB_IDX, // What attibute index will this array feed in the vertex shader (see buildProgram)
crtModel->texcoordSize, // How many elements are there per texture coord?
crtModel->texcoordType, // What is the type of this data in the array?
GL_TRUE, // Do we want to normalize this data (0-1 range for fixed-point types)
crtModel->texcoordSize*texcoordTypeSize, // What is the stride (i.e. bytes between texcoords)?
0); // What is the offset in the VBO to the texcoord data?
glEnableVertexAttribArray(TEXCOORD_ATTRIB_IDX);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, elementBufferName);
#endif
glUniform1f(alphaValue, 1.0);
// Cull back faces now that we no longer render
// with an inverted matrix
//glCullFace(GL_BACK);
// Draw the CRT object and others
glDrawElements(GL_TRIANGLES, crtNumElements, crtElementType, 0);
// Render HUD nodes
glnode_renderNodes();
_vid_dirty = false;
#if USE_GLUT
glutSwapBuffers();
#endif
GL_ERRLOG("gldriver_render");
}
static void gldriver_reshape(int w, int h) {
//LOG("reshape to w:%d h:%d", w, h);
windowWidth = w;
windowHeight = h;
#if MOBILE_DEVICE
int viewportHeightPrevious = viewportHeight;
#endif
int w2 = ((float)h * (SCANWIDTH/(float)SCANHEIGHT));
int h2 = ((float)w / (SCANWIDTH/(float)SCANHEIGHT));
if (w2 <= w) {
// h is priority
viewportX = (w-w2)/2;
viewportY = 0;
viewportWidth = w2;
viewportHeight = h;
//LOG("OK1 : x:%d,y:%d w:%d,h:%d", viewportX, viewportY, viewportWidth, viewportHeight);
} else if (h2 <= h) {
viewportX = 0;
viewportY = (h-h2)/2;
viewportWidth = w;
viewportHeight = h2;
//LOG("OK2 : x:%d,y:%d w:%d,h:%d", viewportX, viewportY, viewportWidth, viewportHeight);
} else {
viewportX = 0;
viewportY = 0;
viewportWidth = w;
viewportHeight = h;
//LOG("small viewport : x:%d,y:%d w:%d,h:%d", viewportX, viewportY, viewportWidth, viewportHeight);
}
#if MOBILE_DEVICE
if (viewportHeight < viewportHeightPrevious) {
adjustedHeight = viewportHeightPrevious - viewportHeight;
} else {
adjustedHeight = 0;
}
#endif
glViewport(viewportX, viewportY, viewportWidth, viewportHeight);
// Reshape HUD nodes
glnode_reshapeNodes(w, h);
}
#if USE_GLUT
static void gldriver_init_glut(GLuint fbo) {
glutInit(&argc, argv);
glutInitDisplayMode(/*GLUT_DOUBLE|*/GLUT_RGBA|GLUT_DEPTH);
glutInitWindowSize(windowWidth, windowHeight);
//glutInitContextVersion(4, 0); -- Is this needed?
glutInitContextProfile(GLUT_CORE_PROFILE);
glutWindow = glutCreateWindow(PACKAGE_NAME);
GL_ERRQUIT("GLUT initialization");
if (glewInit()) {
ERRQUIT("Unable to initialize GLEW");
}
gldriver_init_common();
glutTimerFunc(16, gldriver_update, 0);
glutDisplayFunc(gldriver_render);
glutReshapeFunc(gldriver_reshape);
#if !TESTING
glutKeyboardFunc(gldriver_on_key_down);
glutKeyboardUpFunc(gldriver_on_key_up);
glutSpecialFunc(gldriver_on_key_special_down);
glutSpecialUpFunc(gldriver_on_key_special_up);
//glutMouseFunc(gldriver_mouse);
//glutMotionFunc(gldriver_mouse_drag);
#endif
}
#endif
//----------------------------------------------------------------------------
// backend renderer API
static void gldriver_init(void *fbo) {
safe_to_do_opengl_logging = true;
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wpointer-to-int-cast"
defaultFBO = (GLuint)fbo;
#pragma GCC diagnostic pop
#if defined(__APPLE__)
gldriver_init_common();
#elif defined(ANDROID)
gldriver_init_common();
#elif USE_GLUT
gldriver_init_glut(defaultFBO);
#else
#error no working codepaths
#endif
glnode_setupNodes();
}
static void gldriver_main_loop(void) {
#if USE_GLUT
glutSetOption(GLUT_ACTION_ON_WINDOW_CLOSE, GLUT_ACTION_GLUTMAINLOOP_RETURNS);
glutMainLoop();
LOG("GLUT main loop finished...");
_gldriver_shutdown();
#endif
// fall through if not GLUT
}
__attribute__((constructor(CTOR_PRIORITY_EARLY)))
static void _init_glvideo(void) {
LOG("Initializing OpenGL renderer");
glvideo_backend.init = &gldriver_init;
glvideo_backend.main_loop = &gldriver_main_loop;
glvideo_backend.reshape = &gldriver_reshape;
glvideo_backend.render = &gldriver_render;
glvideo_backend.shutdown = &gldriver_shutdown;
video_backend = &glvideo_backend;
}
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