mirror of
https://github.com/bradgrantham/apple2e.git
synced 2024-06-08 17:29:31 +00:00
Screen projection matrix to shaders for regularity
Multiply by a matrix in vertex shaders to convert from pixel coordinates to window coordinates, moving that operation out to a centralized place in the application.
This commit is contained in:
Brad Grantham
parent
c9cf0a753a
commit
faea049a6b
161
interface.cpp
161
interface.cpp
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@ -62,45 +62,25 @@ GLuint font_texture;
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GLuint font_texture_location;
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const int fonttexture_w = 7;
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const int fonttexture_h = 8 * 96;
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GLuint textport_texture[2];
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GLuint textport_texture_location;
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GLuint blink_location;
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GLuint lores_texture_location;
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GLuint textport_x_offset_location;
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GLuint textport_y_offset_location;
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GLuint textport_to_screen_location;
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const int textport_w = 40;
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const int textport_h = 24;
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GLuint lores_texture_location;
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GLuint hires_texture[2];
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GLuint hires_texture_location;
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const int hires_w = 320; // MSBit is color chooser, Apple ][ weirdness
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const int hires_h = 192;
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#if 0
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struct button
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{
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int string_texture;
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string content;
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button(const string& content_) :
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content(content_)
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{
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// construct string texture
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}
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tuple<int, int> get_dimensions()
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{
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int w = content.size() * 7 + 3 * 2;
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int h = 8 + 3 * 2;
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}
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void draw()
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{
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// draw lines 2 pixels around
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// draw lines 1 pixels around
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// blank area 0 pixels around
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// draw string
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}
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};
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struct buttons
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{
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}
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#endif
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GLuint hires_to_screen_location;
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GLuint hires_x_offset_location;
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GLuint hires_y_offset_location;
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static void CheckOpenGL(const char *filename, int line)
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{
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@ -168,27 +148,33 @@ GLuint text_program;
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GLuint lores_program;
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static const char *hires_vertex_shader = "\n\
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uniform mat3 to_screen;\n\
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in vec2 vertex_coords;\n\
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out vec2 raster_coords;\n\
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uniform float x_offset;\n\
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uniform float y_offset;\n\
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\n\
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void main()\n\
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{\n\
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vec2 eye_coords = vertex_coords / vec2(280,192) * vec2(2, 2) - vec2(1, 1);\n\
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raster_coords = vertex_coords;\n\
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gl_Position = vec4(eye_coords * vec2(1, -1), 0.5, 1.0);\n\
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vec3 screen_coords = to_screen * vec3(vertex_coords + vec2(x_offset, y_offset), 1);\n\
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gl_Position = vec4(screen_coords.x, screen_coords.y, .5, 1);\n\
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}\n";
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static const char *text_vertex_shader = "\n\
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uniform mat3 to_screen;\n\
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in vec2 vertex_coords;\n\
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uniform float x_offset;\n\
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uniform float y_offset;\n\
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out vec2 text_coords;\n\
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out vec2 raster_coords;\n\
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\n\
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void main()\n\
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{\n\
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vec2 eye_coords = vertex_coords / vec2(280,192) * vec2(2, 2) - vec2(1, 1);\n\
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raster_coords = vertex_coords;\n\
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text_coords = vec2(int(vertex_coords.x / 7), int(vertex_coords.y / 8));\n\
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gl_Position = vec4(eye_coords * vec2(1, -1), 0.5, 1.0);\n\
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vec3 screen_coords = to_screen * vec3(vertex_coords + vec2(x_offset, y_offset), 1);\n\
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gl_Position = vec4(screen_coords.x, screen_coords.y, .5, 1);\n\
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}\n";
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static const char *hires_fragment_shader = "\n\
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@ -443,11 +429,17 @@ void initialize_gl(void)
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hires_program = GenerateProgram("hires", hires_vertex_shader, hires_fragment_shader);
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hires_texture_location = glGetUniformLocation(hires_program, "hires_texture");
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hires_to_screen_location = glGetUniformLocation(hires_program, "to_screen");
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hires_x_offset_location = glGetUniformLocation(hires_program, "x_offset");
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hires_y_offset_location = glGetUniformLocation(hires_program, "y_offset");
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text_program = GenerateProgram("textport", text_vertex_shader, text_fragment_shader);
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textport_texture_location = glGetUniformLocation(text_program, "textport_texture");
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font_texture_location = glGetUniformLocation(text_program, "font_texture");
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blink_location = glGetUniformLocation(text_program, "blink");
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textport_x_offset_location = glGetUniformLocation(text_program, "x_offset");
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textport_y_offset_location = glGetUniformLocation(text_program, "y_offset");
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textport_to_screen_location = glGetUniformLocation(text_program, "to_screen");
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CheckOpenGL(__FILE__, __LINE__);
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lores_program = GenerateProgram("textport", text_vertex_shader, lores_fragment_shader);
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@ -460,19 +452,27 @@ void initialize_gl(void)
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unsigned char textport[2][24][40];
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void set_shader(DisplayMode display_mode, bool mixed_mode, int blink)
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void set_textport_shader(float to_screen[9], GLuint textport_texture, int blink, float x, float y)
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{
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glUseProgram(text_program);
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glActiveTexture(GL_TEXTURE0);
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glBindTexture(GL_TEXTURE_RECTANGLE, textport_texture);
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glUniform1i(textport_texture_location, 0);
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glActiveTexture(GL_TEXTURE1);
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glBindTexture(GL_TEXTURE_RECTANGLE, font_texture);
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glUniform1i(font_texture_location, 1);
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glUniform1i(blink_location, blink);
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glUniform1f(textport_x_offset_location, x);
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glUniform1f(textport_y_offset_location, y);
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glUniformMatrix3fv(textport_to_screen_location, 1, GL_FALSE, to_screen);
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}
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void set_shader(float to_screen[9], DisplayMode display_mode, bool mixed_mode, int blink, float x, float y)
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{
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if(mixed_mode || (display_mode == TEXT)) {
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glUseProgram(text_program);
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glActiveTexture(GL_TEXTURE0);
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glBindTexture(GL_TEXTURE_RECTANGLE, textport_texture[display_page]);
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glUniform1i(textport_texture_location, 0);
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glActiveTexture(GL_TEXTURE1);
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glBindTexture(GL_TEXTURE_RECTANGLE, font_texture);
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glUniform1i(font_texture_location, 1);
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glUniform1i(blink_location, blink);
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set_textport_shader(to_screen, textport_texture[display_page], blink, x, y);
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} else if(display_mode == LORES) {
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@ -481,6 +481,9 @@ void set_shader(DisplayMode display_mode, bool mixed_mode, int blink)
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glActiveTexture(GL_TEXTURE0);
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glBindTexture(GL_TEXTURE_RECTANGLE, textport_texture[display_page]);
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glUniform1i(lores_texture_location, 0);
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glUniformMatrix3fv(textport_to_screen_location, 1, GL_FALSE, to_screen);
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glUniform1f(textport_x_offset_location, x);
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glUniform1f(textport_y_offset_location, y);
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} else if(display_mode == HIRES) {
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@ -489,10 +492,65 @@ void set_shader(DisplayMode display_mode, bool mixed_mode, int blink)
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glActiveTexture(GL_TEXTURE0);
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glBindTexture(GL_TEXTURE_RECTANGLE, hires_texture[display_page]);
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glUniform1i(hires_texture_location, 0);
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glUniformMatrix3fv(hires_to_screen_location, 1, GL_FALSE, to_screen);
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glUniform1f(hires_x_offset_location, x);
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glUniform1f(hires_y_offset_location, y);
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}
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}
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#if 0
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struct button
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{
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GLuint string_texture;
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GLuint rectangle;
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string content;
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button(const string& content_) :
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content(content_)
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{
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// construct string texture
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auto_ptr<char*> bytes = new content.size() + 1;
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int i = 0;
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for(auto it = content.begin(); it != content.end(); it++) {
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unsigned char c = *it;
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if(c > ' ' && c <= '?')
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bytes[i] = c - ' ' + 160;
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else if(c > '@' && c <= '_')
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bytes[i] = c - '@' + 128;
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else if(c > '`' && c <= '~')
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bytes[i] = c - '`' + 224;
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else
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bytes[i] = 255;
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i++;
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}
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string_texture = initialize_texture(i, 1, bytes);
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rectangle = make_rectangle_vertex_array(0, 0, 280, 160);
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}
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tuple<int, int> get_dimensions()
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{
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int w = content.size() * 7 + 3 * 2;
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int h = 8 + 3 * 2;
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}
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void draw(float to_screen[9], float x, float y)
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{
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// draw lines 2 pixels around
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// draw lines 1 pixels around
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// blank area 0 pixels around
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set_textport_shader(to_screen, string_texture, (elapsed_millis / 1870) % 2, x, y);
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glBindVertexArray(rectangle);
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CheckOpenGL(__FILE__, __LINE__);
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glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
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CheckOpenGL(__FILE__, __LINE__);
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}
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};
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struct buttons
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{
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};
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#endif
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static void redraw(GLFWwindow *window)
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{
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chrono::time_point<chrono::system_clock> now;
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@ -504,14 +562,25 @@ static void redraw(GLFWwindow *window)
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glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
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set_shader(display_mode, false, (elapsed_millis / 1870) % 2);
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float to_screen[9];
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to_screen[0 * 3 + 0] = 2/280.0;
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to_screen[0 * 3 + 1] = 0;
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to_screen[0 * 3 + 2] = 0;
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to_screen[1 * 3 + 0] = 0;
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to_screen[1 * 3 + 1] = -2/192.0;
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to_screen[1 * 3 + 2] = 0;
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to_screen[2 * 3 + 0] = -1;
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to_screen[2 * 3 + 1] = 1;
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to_screen[2 * 3 + 2] = 1;
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set_shader(to_screen, display_mode, false, (elapsed_millis / 1870) % 2, 0, 0);
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glBindVertexArray(upper_screen_area);
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CheckOpenGL(__FILE__, __LINE__);
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glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
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CheckOpenGL(__FILE__, __LINE__);
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set_shader(display_mode, mixed_mode, (elapsed_millis / 1870) % 2);
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set_shader(to_screen, display_mode, mixed_mode, (elapsed_millis / 1870) % 2, 0, 0);
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glBindVertexArray(lower_screen_area);
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CheckOpenGL(__FILE__, __LINE__);
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