src/gallium/tests/graw/tri-gs.c

   1 /* Display a cleared blue window.  This demo has no dependencies on
   2  * any utility code, just the graw interface and gallium.
   3  */
   4
   5 #include <stdio.h>
   6 #include "state_tracker/graw.h"
   7 #include "pipe/p_screen.h"
   8 #include "pipe/p_context.h"
   9 #include "pipe/p_state.h"
  10 #include "pipe/p_defines.h"
  11
  12 #include "util/u_memory.h"      /* Offset() */
  13 #include "util/u_draw_quad.h"
  14
  15 enum pipe_format formats[] = {
  16    PIPE_FORMAT_R8G8B8A8_UNORM,
  17    PIPE_FORMAT_B8G8R8A8_UNORM,
  18    PIPE_FORMAT_NONE
  19 };
  20
  21 static const int WIDTH = 300;
  22 static const int HEIGHT = 300;
  23
  24 static struct pipe_screen *screen = NULL;
  25 static struct pipe_context *ctx = NULL;
  26 static struct pipe_surface *surf = NULL;
  27 static struct pipe_resource *tex = NULL;
  28 static void *window = NULL;
  29
  30 struct vertex {
  31    float position[4];
  32    float color[4];
  33 };
  34
  35 static struct vertex vertices[4] =
  36 {
  37    { { 0.0f, -0.9f, 0.0f, 1.0f },
  38      { 1.0f, 0.0f, 0.0f, 1.0f }
  39    },
  40    { { -0.9f, 0.9f, 0.0f, 1.0f },
  41      { 0.0f, 1.0f, 0.0f, 1.0f }
  42    },
  43    { { 0.9f, 0.9f, 0.0f, 1.0f },
  44      { 0.0f, 0.0f, 1.0f, 1.0f }
  45    }
  46 };
  47
  48
  49
  50
  51 static void set_viewport( float x, float y,
  52                           float width, float height,
  53                           float near, float far)
  54 {
  55    float z = far;
  56    float half_width = (float)width / 2.0f;
  57    float half_height = (float)height / 2.0f;
  58    float half_depth = ((float)far - (float)near) / 2.0f;
  59    struct pipe_viewport_state vp;
  60
  61    vp.scale[0] = half_width;
  62    vp.scale[1] = half_height;
  63    vp.scale[2] = half_depth;
  64    vp.scale[3] = 1.0f;
  65
  66    vp.translate[0] = half_width + x;
  67    vp.translate[1] = half_height + y;
  68    vp.translate[2] = half_depth + z;
  69    vp.translate[3] = 0.0f;
  70
  71    ctx->set_viewport_state( ctx, &vp );
  72 }
  73
  74 static void set_vertices( void )
  75 {
  76    struct pipe_vertex_element ve[2];
  77    struct pipe_vertex_buffer vbuf;
  78    void *handle;
  79
  80    memset(ve, 0, sizeof ve);
  81
  82    ve[0].src_offset = Offset(struct vertex, position);
  83    ve[0].src_format = PIPE_FORMAT_R32G32B32A32_FLOAT;
  84    ve[1].src_offset = Offset(struct vertex, color);
  85    ve[1].src_format = PIPE_FORMAT_R32G32B32A32_FLOAT;
  86
  87    handle = ctx->create_vertex_elements_state(ctx, 2, ve);
  88    ctx->bind_vertex_elements_state(ctx, handle);
  89
  90
  91    vbuf.stride = sizeof( struct vertex );
  92    vbuf.buffer_offset = 0;
  93    vbuf.buffer = screen->user_buffer_create(screen,
  94                                             vertices,
  95                                             sizeof(vertices),
  96                                             PIPE_BIND_VERTEX_BUFFER);
  97
  98    ctx->set_vertex_buffers(ctx, 1, &vbuf);
  99 }
 100
 101 static void set_vertex_shader( void )
 102 {
 103    void *handle;
 104    const char *text =
 105       "VERT\n"
 106       "DCL IN[0]\n"
 107       "DCL IN[1]\n"
 108       "DCL OUT[0], POSITION\n"
 109       "DCL OUT[1], COLOR\n"
 110       "  0: MOV OUT[1], IN[1]\n"
 111       "  1: MOV OUT[0], IN[0]\n"
 112       "  2: END\n";
 113
 114    handle = graw_parse_vertex_shader(ctx, text);
 115    ctx->bind_vs_state(ctx, handle);
 116 }
 117
 118 static void set_fragment_shader( void )
 119 {
 120    void *handle;
 121    const char *text =
 122       "FRAG\n"
 123       "DCL IN[0], COLOR, LINEAR\n"
 124       "DCL OUT[0], COLOR\n"
 125       "  0: MOV OUT[0], IN[0]\n"
 126       "  1: END\n";
 127
 128    handle = graw_parse_fragment_shader(ctx, text);
 129    ctx->bind_fs_state(ctx, handle);
 130 }
 131
 132
 133 static void set_geometry_shader( void )
 134 {
 135    void *handle;
 136    const char *text =
 137       "GEOM\n"
 138       "PROPERTY GS_INPUT_PRIMITIVE TRIANGLES\n"
 139       "PROPERTY GS_OUTPUT_PRIMITIVE TRIANGLE_STRIP\n"
 140       "DCL IN[][0], POSITION, CONSTANT\n"
 141       "DCL IN[][1], COLOR, CONSTANT\n"
 142       "DCL OUT[0], POSITION, CONSTANT\n"
 143       "DCL OUT[1], COLOR, CONSTANT\n"
 144       "0:MOV OUT[0], IN[0][0]\n"
 145       "1:MOV OUT[1], IN[0][1]\n"
 146       "2:EMIT\n"
 147       "3:MOV OUT[0], IN[1][0]\n"
 148       "4:MOV OUT[1], IN[0][1]\n" /* copy color from input vertex 0 */
 149       "5:EMIT\n"
 150       "6:MOV OUT[0], IN[2][0]\n"
 151       "7:MOV OUT[1], IN[2][1]\n"
 152       "8:EMIT\n"
 153       "9:ENDPRIM\n"
 154       "10:END\n";
 155
 156    handle = graw_parse_geometry_shader(ctx, text);
 157    ctx->bind_gs_state(ctx, handle);
 158 }
 159
 160 static void draw( void )
 161 {
 162    union pipe_color_union clear_color = { {1,0,1,1} };
 163
 164    ctx->clear(ctx, PIPE_CLEAR_COLOR, &clear_color, 0, 0);
 165    util_draw_arrays(ctx, PIPE_PRIM_TRIANGLES, 0, 3);
 166    ctx->flush(ctx, NULL);
 167
 168    screen->flush_frontbuffer(screen, tex, 0, 0, window);
 169 }
 170
 171
 172 static void init( void )
 173 {
 174    struct pipe_framebuffer_state fb;
 175    struct pipe_resource templat;
 176    struct pipe_surface surf_tmpl;
 177    int i;
 178
 179    /* It's hard to say whether window or screen should be created
 180     * first.  Different environments would prefer one or the other.
 181     *
 182     * Also, no easy way of querying supported formats if the screen
 183     * cannot be created first.
 184     */
 185    for (i = 0; formats[i] != PIPE_FORMAT_NONE; i++) {
 186       screen = graw_create_window_and_screen(0, 0, 300, 300,
 187                                              formats[i],
 188                                              &window);
 189       if (window && screen)
 190          break;
 191    }
 192    if (!screen || !window) {
 193       fprintf(stderr, "Unable to create window\n");
 194       exit(1);
 195    }
 196
 197    ctx = screen->context_create(screen, NULL);
 198    if (ctx == NULL)
 199       exit(3);
 200
 201    templat.target = PIPE_TEXTURE_2D;
 202    templat.format = formats[i];
 203    templat.width0 = WIDTH;
 204    templat.height0 = HEIGHT;
 205    templat.depth0 = 1;
 206    templat.array_size = 1;
 207    templat.last_level = 0;
 208    templat.nr_samples = 1;
 209    templat.bind = (PIPE_BIND_RENDER_TARGET |
 210                    PIPE_BIND_DISPLAY_TARGET);
 211
 212    tex = screen->resource_create(screen,
 213                                  &templat);
 214    if (tex == NULL)
 215       exit(4);
 216
 217    surf_tmpl.format = templat.format;
 218    surf_tmpl.usage = PIPE_BIND_RENDER_TARGET;
 219    surf_tmpl.u.tex.level = 0;
 220    surf_tmpl.u.tex.first_layer = 0;
 221    surf_tmpl.u.tex.last_layer = 0;
 222    surf = ctx->create_surface(ctx, tex, &surf_tmpl);
 223    if (surf == NULL)
 224       exit(5);
 225
 226    memset(&fb, 0, sizeof fb);
 227    fb.nr_cbufs = 1;
 228    fb.width = WIDTH;
 229    fb.height = HEIGHT;
 230    fb.cbufs[0] = surf;
 231
 232    ctx->set_framebuffer_state(ctx, &fb);
 233
 234    {
 235       struct pipe_blend_state blend;
 236       void *handle;
 237       memset(&blend, 0, sizeof blend);
 238       blend.rt[0].colormask = PIPE_MASK_RGBA;
 239       handle = ctx->create_blend_state(ctx, &blend);
 240       ctx->bind_blend_state(ctx, handle);
 241    }
 242
 243    {
 244       struct pipe_depth_stencil_alpha_state depthstencil;
 245       void *handle;
 246       memset(&depthstencil, 0, sizeof depthstencil);
 247       handle = ctx->create_depth_stencil_alpha_state(ctx, &depthstencil);
 248       ctx->bind_depth_stencil_alpha_state(ctx, handle);
 249    }
 250
 251    {
 252       struct pipe_rasterizer_state rasterizer;
 253       void *handle;
 254       memset(&rasterizer, 0, sizeof rasterizer);
 255       rasterizer.cull_face = PIPE_FACE_NONE;
 256       rasterizer.gl_rasterization_rules = 1;
 257       rasterizer.depth_clip = 1;
 258       handle = ctx->create_rasterizer_state(ctx, &rasterizer);
 259       ctx->bind_rasterizer_state(ctx, handle);
 260    }
 261
 262    set_viewport(0, 0, WIDTH, HEIGHT, 30, 1000);
 263    set_vertices();
 264    set_vertex_shader();
 265    set_fragment_shader();
 266    set_geometry_shader();
 267 }
 268
 269
 270 int main( int argc, char *argv[] )
 271 {
 272    init();
 273
 274    graw_set_display_func( draw );
 275    graw_main_loop();
 276    return 0;
 277 }