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renderer/gles2: Compute texture coordinates based off of vertex positions

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This commit is contained in:
Alexander Orzechowski 2023-05-23 02:16:29 -04:00
parent 45b2a8eee2
commit b1d26ed47b
3 changed files with 15 additions and 20 deletions
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2
include/render/gles2.h
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@ -25,10 +25,10 @@ struct wlr_gles2_pixel_format {
struct wlr_gles2_tex_shader {
GLuint program;
GLint proj;
GLint tex_proj;
GLint tex;
GLint alpha;
GLint pos_attrib;
GLint tex_attrib;
};
struct wlr_gles2_renderer {

26
render/gles2/renderer.c
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@ -321,27 +321,21 @@ static bool gles2_render_subtexture_with_matrix(
glUniform1i(shader->tex, 0);
glUniform1f(shader->alpha, alpha);
const GLfloat x1 = box->x / wlr_texture->width;
const GLfloat y1 = box->y / wlr_texture->height;
const GLfloat x2 = (box->x + box->width) / wlr_texture->width;
const GLfloat y2 = (box->y + box->height) / wlr_texture->height;
const GLfloat texcoord[] = {
x2, y1, // top right
x1, y1, // top left
x2, y2, // bottom right
x1, y2, // bottom left
};
float tex_matrix[9];
wlr_matrix_identity(tex_matrix);
wlr_matrix_translate(tex_matrix, box->x / texture->wlr_texture.width,
box->y / texture->wlr_texture.height);
wlr_matrix_scale(tex_matrix, box->width / texture->wlr_texture.width,
box->height / texture->wlr_texture.height);
glUniformMatrix3fv(shader->tex_proj, 1, GL_FALSE, tex_matrix);
glVertexAttribPointer(shader->pos_attrib, 2, GL_FLOAT, GL_FALSE, 0, verts);
glVertexAttribPointer(shader->tex_attrib, 2, GL_FLOAT, GL_FALSE, 0, texcoord);
glEnableVertexAttribArray(shader->pos_attrib);
glEnableVertexAttribArray(shader->tex_attrib);
glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
glDisableVertexAttribArray(shader->pos_attrib);
glDisableVertexAttribArray(shader->tex_attrib);
glBindTexture(texture->target, 0);
@ -828,10 +822,10 @@ struct wlr_renderer *wlr_gles2_renderer_create(struct wlr_egl *egl) {
goto error;
}
renderer->shaders.tex_rgba.proj = glGetUniformLocation(prog, "proj");
renderer->shaders.tex_rgba.tex_proj = glGetUniformLocation(prog, "tex_proj");
renderer->shaders.tex_rgba.tex = glGetUniformLocation(prog, "tex");
renderer->shaders.tex_rgba.alpha = glGetUniformLocation(prog, "alpha");
renderer->shaders.tex_rgba.pos_attrib = glGetAttribLocation(prog, "pos");
renderer->shaders.tex_rgba.tex_attrib = glGetAttribLocation(prog, "texcoord");
renderer->shaders.tex_rgbx.program = prog =
link_program(renderer, common_vert_src, tex_rgbx_frag_src);
@ -839,10 +833,10 @@ struct wlr_renderer *wlr_gles2_renderer_create(struct wlr_egl *egl) {
goto error;
}
renderer->shaders.tex_rgbx.proj = glGetUniformLocation(prog, "proj");
renderer->shaders.tex_rgbx.tex_proj = glGetUniformLocation(prog, "tex_proj");
renderer->shaders.tex_rgbx.tex = glGetUniformLocation(prog, "tex");
renderer->shaders.tex_rgbx.alpha = glGetUniformLocation(prog, "alpha");
renderer->shaders.tex_rgbx.pos_attrib = glGetAttribLocation(prog, "pos");
renderer->shaders.tex_rgbx.tex_attrib = glGetAttribLocation(prog, "texcoord");
if (renderer->exts.OES_egl_image_external) {
renderer->shaders.tex_ext.program = prog =
@ -851,10 +845,10 @@ struct wlr_renderer *wlr_gles2_renderer_create(struct wlr_egl *egl) {
goto error;
}
renderer->shaders.tex_ext.proj = glGetUniformLocation(prog, "proj");
renderer->shaders.tex_ext.tex_proj = glGetUniformLocation(prog, "tex_proj");
renderer->shaders.tex_ext.tex = glGetUniformLocation(prog, "tex");
renderer->shaders.tex_ext.alpha = glGetUniformLocation(prog, "alpha");
renderer->shaders.tex_ext.pos_attrib = glGetAttribLocation(prog, "pos");
renderer->shaders.tex_ext.tex_attrib = glGetAttribLocation(prog, "texcoord");
}
pop_gles2_debug(renderer);

7
render/gles2/shaders/common.vert
View File

@ -1,9 +1,10 @@
uniform mat3 proj;
uniform mat3 tex_proj;
attribute vec2 pos;
attribute vec2 texcoord;
varying vec2 v_texcoord;
void main() {
gl_Position = vec4(vec3(pos, 1.0) * proj, 1.0);
v_texcoord = texcoord;
vec3 pos3 = vec3(pos, 1.0);
gl_Position = vec4(pos3 * proj, 1.0);
v_texcoord = (pos3 * tex_proj).xy;
}