render boxes
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parent
9de467eae9
commit
a7a2193ea6
5 changed files with 174 additions and 18 deletions
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@ -81,7 +81,9 @@ struct {
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GLuint font_prog;
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GLuint box_prog;
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GLuint font_buffer;
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GLuint box_buffer;
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GLint viewsize_loc;
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GLint box_viewsize_loc;
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GLint texturesize_loc;
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struct vtstack font_stack;
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struct vcstack box_stack;
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@ -322,13 +324,13 @@ static int update_font_texture(void)
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// TODO: push window size uniforms
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int ren_init(SDL_Window *w)
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{
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// Initialize OpenGL
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if (!w)
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REN_RET(-1, REN_INVAL)
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ren.gl = SDL_GL_CreateContext(w);
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if (!ren.gl)
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REN_RET(-1, REN_CONTEXT)
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// select some features
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GL(glEnable(GL_BLEND))
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GL(glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA))
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GL(glDisable(GL_CULL_FACE))
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@ -341,11 +343,12 @@ int ren_init(SDL_Window *w)
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if (glew_err != GLEW_OK)
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REN_RET(glew_err, REN_GLEW);
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// Load font
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ren.font = font_init();
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if (!ren.font) REN_RET(-1, REN_FONT)
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if (font_load(ren.font, FONT_PATH, 20)) REN_RET(-1, REN_FONT)
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font_dump(ren.font, "./atlas.png");
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// load font texture (atlas)
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ren.font_texture = ren_texturer_rect(
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(const char *)ren.font->atlas,
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ren.font->width,
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@ -353,16 +356,18 @@ int ren_init(SDL_Window *w)
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GL_LINEAR, GL_LINEAR);
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if (!ren.font_texture) return -1;
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ren.font_prog = ren_compile_program(FONT_VERSHADER, FONT_FRAGSHADER);
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if (!ren.font_prog) return -1;
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// Create stacks
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ren.font_stack = vtstack_init();
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ren.box_stack = vcstack_init();
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ren.box_stack = vcstack_init();
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// generate the font buffer object
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GL(glGenBuffers(1, &ren.font_buffer))
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if (!ren.font_buffer) REN_RET(-1, REN_BUFFER)
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GL(glGenBuffers(1, &ren.box_buffer))
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if (!ren.box_buffer) REN_RET(-1, REN_BUFFER)
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// Compile font shaders
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ren.font_prog = ren_compile_program(FONT_VERSHADER, FONT_FRAGSHADER);
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if (!ren.font_prog) return -1;
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// create the uniforms, if the returned value is -1 then the uniform may have
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// been optimized away, in any case do not return, just give a warning
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ren.viewsize_loc = GL(glGetUniformLocation(ren.font_prog, "viewsize"))
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@ -372,6 +377,14 @@ int ren_init(SDL_Window *w)
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if (ren.texturesize_loc == -1)
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printf("uniform %s was optimized away\n", "texturesize");
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// Compile box shaders
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ren.box_prog = ren_compile_program(BOX_VERSHADER, BOX_FRAGSHADER);
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if (!ren.box_prog) return -1;
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ren.box_viewsize_loc = GL(glGetUniformLocation(ren.box_prog, "viewsize"))
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if (ren.box_viewsize_loc == -1)
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printf("uniform %s was optimized away\n", "viewsize");
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// Finishing touches
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int width, height;
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SDL_GetWindowSize(w, &width, &height);
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ren_update_viewport(width, height);
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@ -382,14 +395,20 @@ int ren_init(SDL_Window *w)
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}
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int ren_clear(void)
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{
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GL(glScissor(0, 0, ren.width, ren.height))
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GL(glClear(GL_COLOR_BUFFER_BIT));
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return 0;
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}
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static int ren_draw_font_stack(void)
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{
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GL(glUseProgram(ren.font_prog))
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GL(glBindBuffer(GL_ARRAY_BUFFER, ren.font_buffer))
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GL(glViewport(0, 0, ren.width, ren.height))
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GL(glScissor(0, 0, ren.width, ren.height))
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GL(glClear(GL_COLOR_BUFFER_BIT));
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// this has caused me some trouble, convert from image coordiates to viewport
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GL(glScissor(ren.s_x, ren.height-ren.s_y-ren.s_h, ren.s_w, ren.s_h))
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GL(glUniform2i(ren.viewsize_loc, ren.width, ren.height))
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@ -425,6 +444,54 @@ static int ren_draw_font_stack(void)
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GL(glDisableVertexAttribArray(REN_UV_IDX))
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GL(glBindBuffer(GL_ARRAY_BUFFER, 0))
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GL(glUseProgram(0))
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vtstack_clear(&ren.font_stack);
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return 0;
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}
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static int ren_draw_box_stack(void)
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{
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GL(glUseProgram(ren.box_prog))
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GL(glBindBuffer(GL_ARRAY_BUFFER, ren.box_buffer))
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GL(glViewport(0, 0, ren.width, ren.height))
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GL(glScissor(0, 0, ren.width, ren.height))
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GL(glUniform2i(ren.box_viewsize_loc, ren.width, ren.height))
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GL(glEnableVertexAttribArray(REN_VERTEX_IDX))
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GL(glEnableVertexAttribArray(REN_COLOR_IDX))
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// when passing ints to glVertexAttribPointer they are automatically
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// converted to floats
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GL(glVertexAttribPointer(
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REN_VERTEX_IDX,
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2,
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GL_INT,
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GL_FALSE,
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sizeof(struct v_col),
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0))
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// the color gets normalized
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GL(glVertexAttribPointer(
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REN_COLOR_IDX,
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4,
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GL_INT,
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GL_TRUE,
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sizeof(struct v_col),
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(void*)sizeof(vec2_i)))
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// TODO: implement size and damage tracking on stacks
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GL(glBufferData(
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GL_ARRAY_BUFFER,
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ren.box_stack.idx*sizeof(struct v_col),
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ren.box_stack.items,
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GL_DYNAMIC_DRAW))
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GL(glDrawArrays(GL_TRIANGLES, 0, ren.box_stack.idx))
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GL(glDisableVertexAttribArray(REN_VERTEX_IDX))
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GL(glDisableVertexAttribArray(REN_COLOR_IDX))
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GL(glBindBuffer(GL_ARRAY_BUFFER, 0))
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GL(glUseProgram(0))
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vcstack_clear(&ren.box_stack);
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return 0;
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}
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@ -552,16 +619,63 @@ int ren_render_text(const char *str, int x, int y, int w, int h, int size)
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// inefficient but is simpler and allows for individual scissors
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ren_set_scissor(x, y, w, h);
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ren_draw_font_stack();
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vtstack_clear(&ren.font_stack);
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return 0;
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}
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// re-normalize color from 0-255 to 0-0x7fffffff, technically i'm dividing by 256 here
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#define RENORM(x) (((unsigned long long)(x)*0x7fffffff)>>8)
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#define R(x) (x&0xff)
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#define G(x) ((x>>8)&0xff)
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#define B(x) ((x>>16)&0xff)
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#define A(x) ((x>>24)&0xff)
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static int ren_push_box(int x, int y, int w, int h, unsigned int color)
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{
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struct v_col v;
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vec4_i c = {
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.r = RENORM(R(color)),
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.g = RENORM(G(color)),
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.b = RENORM(B(color)),
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.a = RENORM(A(color)),
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};
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// x1, y1
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v = (struct v_col){ .pos = { .x = x, .y = y+h }, .col = c };
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vcstack_push(&ren.box_stack, &v);
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// x2, y2
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v = (struct v_col){ .pos = { .x = x+w, .y = y+h }, .col = c };
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vcstack_push(&ren.box_stack, &v);
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// x3, y3
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v = (struct v_col){ .pos = { .x = x+w, .y = y }, .col = c };
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vcstack_push(&ren.box_stack, &v);
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// x1, y1
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v = (struct v_col){ .pos = { .x = x, .y = y+h }, .col = c };
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vcstack_push(&ren.box_stack, &v);
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// x3, y3
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v = (struct v_col){ .pos = { .x = x+w, .y = y }, .col = c };
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vcstack_push(&ren.box_stack, &v);
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// x4, y4
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v = (struct v_col){ .pos = { .x = x, .y = y }, .col = c };
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vcstack_push(&ren.box_stack, &v);
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return 0;
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}
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int ren_render_box(int x, int y, int w, int h, unsigned int color)
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{
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ren_push_box(x, y, w, h, color);
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ren_draw_box_stack();
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return 0;
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}
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int ren_free(void)
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{
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GL(glUseProgram(0))
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GL(glBindBuffer(GL_ARRAY_BUFFER, 0))
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GL(glDeleteProgram(ren.box_prog));
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GL(glDeleteProgram(ren.font_prog));
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GL(glDeleteTextures(1, &ren.font_texture))
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GL(glDeleteBuffers(1, &ren.font_buffer))
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SDL_GL_DeleteContext(ren.gl);
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