| /* Test the TGSI_SEMANTIC_FACE fragment shader input. |
| */ |
| |
| #include <stdio.h> |
| |
| #include "graw_util.h" |
| |
| |
| static int width = 300; |
| static int height = 300; |
| |
| static struct graw_info info; |
| |
| struct vertex { |
| float position[4]; |
| float color[4]; |
| }; |
| |
| #define z0 0.2 |
| #define z01 0.5 |
| #define z1 0.4 |
| |
| static struct vertex vertices[] = |
| { |
| /* left quad: clock-wise, front-facing, red */ |
| { |
| {-0.8, -0.9, z0, 1.0 }, |
| { 0, 0, 0, 1 } |
| }, |
| |
| { |
| { -0.2, -0.9, z0, 1.0 }, |
| { 0, 0, 0, 1 } |
| }, |
| |
| { |
| { 0.2, 0.9, z01, 1.0 }, |
| { 0, 0, 0, 1 } |
| }, |
| |
| { |
| {-0.9, 0.9, z01, 1.0 }, |
| { 0, 0, 0, 1 } |
| }, |
| |
| /* right quad : counter-clock-wise, back-facing, green */ |
| { |
| { 0.2, -0.9, z1, 1.0 }, |
| { 1, 1, 1, -1 } |
| }, |
| |
| { |
| { -0.2, 0.8, z1, 1.0 }, |
| { 1, 1, 1, -1 } |
| }, |
| |
| { |
| { 0.9, 0.8, z1, 1.0 }, |
| { 1, 1, 1, -1 } |
| }, |
| |
| { |
| { 0.8, -0.9, z1, 1.0 }, |
| { 1, 1, 1, -1 } |
| }, |
| }; |
| |
| #define NUM_VERTS (sizeof(vertices) / sizeof(vertices[0])) |
| |
| |
| |
| static void |
| set_vertices(void) |
| { |
| struct pipe_vertex_element ve[2]; |
| struct pipe_vertex_buffer vbuf; |
| void *handle; |
| |
| memset(ve, 0, sizeof ve); |
| |
| ve[0].src_offset = Offset(struct vertex, position); |
| ve[0].src_format = PIPE_FORMAT_R32G32B32A32_FLOAT; |
| ve[1].src_offset = Offset(struct vertex, color); |
| ve[1].src_format = PIPE_FORMAT_R32G32B32A32_FLOAT; |
| |
| handle = info.ctx->create_vertex_elements_state(info.ctx, 2, ve); |
| info.ctx->bind_vertex_elements_state(info.ctx, handle); |
| |
| memset(&vbuf, 0, sizeof vbuf); |
| |
| vbuf.stride = sizeof(struct vertex); |
| vbuf.buffer_offset = 0; |
| vbuf.buffer = pipe_buffer_create_with_data(info.ctx, |
| PIPE_BIND_VERTEX_BUFFER, |
| PIPE_USAGE_STATIC, |
| sizeof(vertices), |
| vertices); |
| |
| info.ctx->set_vertex_buffers(info.ctx, 1, &vbuf); |
| } |
| |
| |
| static void |
| set_vertex_shader(void) |
| { |
| void *handle; |
| const char *text = |
| "VERT\n" |
| "DCL IN[0]\n" |
| "DCL IN[1]\n" |
| "DCL OUT[0], POSITION\n" |
| "DCL OUT[1], GENERIC[0]\n" |
| " 0: MOV OUT[0], IN[0]\n" |
| " 1: MOV OUT[1], IN[1]\n" |
| " 2: END\n"; |
| |
| handle = graw_parse_vertex_shader(info.ctx, text); |
| info.ctx->bind_vs_state(info.ctx, handle); |
| } |
| |
| |
| static void |
| set_fragment_shader(void) |
| { |
| void *handle; |
| const char *text = |
| "FRAG\n" |
| "DCL IN[0], FACE, CONSTANT\n" |
| "DCL IN[1], GENERIC, CONSTANT\n" |
| "DCL OUT[0], COLOR\n" |
| "DCL TEMP[0]\n" |
| "IMM FLT32 { 1.0, 0.0, 0.0, 0.0 }\n" |
| "IMM FLT32 { 0.0, 1.0, 0.0, 0.0 }\n" |
| "IMM FLT32 { 0.5, 0.6, 0.0, 0.0 }\n" |
| " 0: SGT TEMP[0].x, IN[0].xxxx, IMM[1].xxxx\n" /* TMP[0].x = IN[0].x > 0.0 */ |
| " 1: IF TEMP[0].xxxx :4\n" |
| " 2: MOV OUT[0], IMM[0]\n" /* front-facing: red */ |
| " 3: ELSE :5\n" |
| " 4: MOV OUT[0], IMM[1]\n" /* back-facing: green */ |
| " 5: ENDIF\n" |
| " 6: END\n"; |
| |
| handle = graw_parse_fragment_shader(info.ctx, text); |
| info.ctx->bind_fs_state(info.ctx, handle); |
| } |
| |
| |
| static void |
| draw(void) |
| { |
| union pipe_color_union clear_color; |
| |
| clear_color.f[0] = 0.25; |
| clear_color.f[1] = 0.25; |
| clear_color.f[2] = 0.25; |
| clear_color.f[3] = 1.00; |
| |
| info.ctx->clear(info.ctx, |
| PIPE_CLEAR_COLOR | PIPE_CLEAR_DEPTHSTENCIL, |
| &clear_color, 1.0, 0); |
| util_draw_arrays(info.ctx, PIPE_PRIM_QUADS, 0, NUM_VERTS); |
| info.ctx->flush(info.ctx, NULL); |
| |
| graw_util_flush_front(&info); |
| } |
| |
| |
| #if 0 |
| static void |
| resize(int w, int h) |
| { |
| width = w; |
| height = h; |
| |
| set_viewport(0, 0, width, height, 30, 1000); |
| } |
| #endif |
| |
| |
| static void |
| init(void) |
| { |
| if (!graw_util_create_window(&info, width, height, 1, TRUE)) |
| exit(1); |
| |
| graw_util_default_state(&info, TRUE); |
| |
| graw_util_viewport(&info, 0, 0, width, height, -1.0, 1.0); |
| |
| set_vertices(); |
| set_vertex_shader(); |
| set_fragment_shader(); |
| } |
| |
| |
| int |
| main(int argc, char *argv[]) |
| { |
| init(); |
| |
| printf("Left quad: clock-wise, front-facing, red\n"); |
| printf("Right quad: counter clock-wise, back-facing, green\n"); |
| |
| graw_set_display_func(draw); |
| /*graw_set_reshape_func(resize);*/ |
| graw_main_loop(); |
| return 0; |
| } |